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How to Replace 1 Lamp Rapid Start Ballast with 2 lamp Instant Start

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A 1 lamp rapid start (series) ballast can be hard to find, but it can be replaced with a 2 lamp instant start (parallel) ballast. Here is how a 2 lamp ballast is wired to a 1 lamp fixture.

2 Lamp Instant Start Ballast Diagram

2 Individual wires, 1 common wire

1 Lamp Series Ballast Lampholder Diagram

2 Lamp Parallel Wiring Diagram

Rapid Start Ballast Diagrams

Factory wiring

1 Lamp Series to 2 Lamp Parallel Lampholder Wiring Diagram

1 Lamp Rapid Start Ballast Replaced with 2 Lamp Instant Start Ballast Diagram